Null tests from angular distributions in D→P1P2l+l− , l=e , μ decays on and off peak

  title={Null tests from angular distributions in 
 decays on and off peak},
  author={Stefan de Boer and Gudrun Hiller},
  journal={Physical Review D},
We systematically analyze the full angular distribution in $D \to P_1 P_2 l^+ l^-$ decays, where $P_{1,2}=\pi,K$, $l=e,\mu$. We identify several null tests of the standard model (SM). Notably, the angular coefficients $I_{5,6,7}$, driven by the leptons' axial-vector coupling $C_{10}^{(\prime)}$, vanish by means of a superior GIM-cancellation and are protected by parity invariance below the weak scale. CP-odd observables related to the angular coefficients $I_{5,6,8,9}$ allow to measure CP… 

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